Non-conventional winding system for high-multiplying-power bridge crane

Abstract

The invention discloses a non-conventional winding system for a high-multiplying-power bridge crane. The system comprises a winding barrel, a fixed pulley block, a balanced pulley block, a movable pulley block and a steel wire rope, which are arranged from top to bottom, wherein a rope unwinding end and a rope winding end of the steel wire rope are fixed at two sides of the winding barrel respectively; a rope unwinding section of the steel wire rope sequentially winds around rope unwinding pulley combinations in the movable pulley block and the fixed pulley block in a mutual staggering manner;a rope winding section of the steel wire rope sequentially winds around rope winding pulley combinations in the movable pulley block and the fixed pulley block in the mutual staggering manner; the steel wire rope is located at a transition section between the rope unwinding section and the rope winding section and winds around the balanced pulley block. According to the non-conventional winding system disclosed by the invention, hoisting tonnages are improved through the increasing of multiplying power of the pulley blocks; the maximum deflection angle of an unwinding barrel of the steel wirerope is reduced through improving a rope winding manner, a transverse force on a side wall of a winding barrel rope groove is reduced, the abrasion of the steel wire rope is reduced, the safety and reliability of hoisting are improved and the winding problem of the high-tonnage and high-multiplying-power bridge crane is solved; the non-conventional winding system has the characteristics of economical efficiency, practicability, novelty and the like.

Description

technical field [0001] The invention relates to an unconventional winding system for a large-magnification bridge machine. Background technique [0002] The commonly used winding system of the bridge type crane is a double pulley block with a double drum, and the pulleys in the pulley block are configured according to the required ratio and structural requirements. Taking the 200t bridge crane as an example, the pulley block multiplier widely used in the 200t bridge crane is 8. For the traditional conventional 8-magnification winding system, refer to the attached figure 1 Shown: Usually when the magnification is ≥ 6, in order not to make the smooth part in the middle of the reel 1' too long, the wire rope branch 5' on the reel 1' is generally led to the two movable pulleys 4' in the middle of the hook group; To avoid the collision of the steel wire rope branch 5' during the movement, the diameter of the two movable pulleys 4' in the middle is slightly larger than that of th...

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Problems solved by technology

[0003] In 2016, the company adopted the 8-magnification pulley block hoisting mechanism when lifting the 200t bridge crane with a lifting height of 18m, and designed two schemes at the same time: in scheme one, the maximum deflection angle of the wire rope when it comes out of the drum reaches 3.83 0 , exceeding the 3.5 required in the standard specification 0 , this situation will aggravate the wear of the wire rope, and cause the side wall of the rope groove to be subjected to a large lateral force, which will damage the groove, easily cause the wire rope to fall out of the groove, and even cause accidents

In the second plan, the size of the reel is increased, and the maximum deflection angle of the wire rope when it comes out of the reel is exactly 3.50, which meets the requirements of the standard specification, but the corresponding matching reducer model is one level larger than the plan. After the size of the reducer is increased, not only the torque and power margins are larger, but also the mass and profile are increased by about 30%, which will increase the mass and external dimensions of the lifting mechanism accordingly, which is not only difficult to arrange, but also greatly increases cost, so the economy and rationality of the second option are poor

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